Hydraulically operated automatic cam grinding machine



Nov. 26, 1935. A, G.BELDEN ET AL 2,022,173

HYDRAULICALLY OPERATED'AUTOMATIC CAM GRINDING MACHINE Filed April 16, 1932 18 Sheets-Sheet 1 gmnnlou ALBERT G. BELDEN HERBERT A. SILL EN WITNESSES Guam,

W QQM- Nov. 26, 1935. A76. BELDEN ET AL HYDRAULICALLY OPERATED AUTOMATIC CAM GRINDING MACHINE Filed April 16, 1932 18 Sheets-Sheet-3 gm amulet ALBERT G. BELDEN HERBERT/L611. VEN

W/TNEssE Wu I I Ww- Nov. 26, 1935. BELDEN AL 2,022,178

HYDRAULICALLY OPERATED AUTOMATIC CAM GRINDING MACHINE Filed April 16, 1932 18 Sheets-Sheet 4 mium ALBERT G Baum/v HERBERT/4. 51L VEN W/ TNESSES Nov. 26, 1935. A. c. BELDEN E1 AL 2,022,178-

HYDRAULICALLY OPERATED AUTOMATIC CAM GRINDING MACHINE Filed April 16, 1932- 18 Sheets-Sheet 5 ALBERT G. BELDEN HERBERT/1. 61L VEN Jwoentou Vl/ITNESSEJ (A, Jmuhewmm TM Mum g My Nov. 26, 1935. BELDEN ET AL 2,022,178

HYDRAULIGALLY OPERATED AUTOMATIC CAM GRINDING MACHINE Filed April 16, 1932 18 Sheets-Sheet 6 I 387 l 8 glwuewtow F/G. ALBERT G. BELDEN HERBERT/1. 81L l/EN Hg'NESJES 3%,, @Q T B W WU).

Nov. 26, 1935. A. G. BELDEN ET AL HYDRAULICALLY OPERATED AUTOMATIC CAM GRINDING MACHINE Filed April 16, 1932 18 Sheets-Sheet'7 gwmwtozd ALBERT G. BELDYEN MTNESSEJ HERBERT/4.6m VEN Nov. 26, 1935. A. G. BELDEN ET AL 2,022,178

I HYDRAULICALLY OPERATED AUTOMATIC CAM GRINDING MACHINE 18 Sheets-Sheet 8 Filed April 16, 1932 gwue'ntm wwww .ALBERT' G. BELDEN HERBERT/4. vS/LVEN W/TNESSE-S a; C 1- Jam 02- (S. v W I Nov. 26, 1935. A. G. BELDEN ET AL HYDRAULICALLY OPERATED AUTOMATIC CAM GRINDING MACHINE l8 Sheets-Sheet 9 Filed April 16, 1932 QN K j U. m I Q P M R WQN gwomtozn ALBERT G. 8510:

HERBERT A 61L VEN @Q t cf Nov. 26, 1935.

A. G. BELDEN ET AL HYDRAULICALLY OPERATED AUTOMATIC CAM GRINDING MACHINE l8 Shee'fs-Sheet 15 Filed April 16, 1932 Jwmmtow ALBERT G. BELDEN MTNESSES HERBERT/4. 6/1. VEN

W @QQ R NOV. 26, 1935. A, G BELDEN AL 2,022,178

HYDRAULICALLY OPERATED AUTOMATIC CAM GRINDING MACHINE Filed April 16, 1932 l8 Sheets-Sheet-l5 FIG-33 3 gnmntou ALBERT G. BELDEN HERBERTA. 51L l/EN Jam- Mam (Dunne VWTNESSES A. ca. BELDEN ET AL 2,022,178

OPERATED AUTOMATIC CAM GRINDING MACHINE 18 Sheets-Sheet 16 Nov. 26, 1935.

HYDRAULICALLY Filed Apx il 16, 1932 An l,

f m 40 335 I m; mygggxn 328 42 I gnvenloiw ALBERT G. BELDEN HERBERT A. S/LI/E/v Nov. 26, 1935. A. G. BELDEN ET AL HYDRAULICALLY OPERATED AUTOMATIC CAM GRINDING MACHINE Filed April 16, 1932 18 SheetsSheet l7 N M 2 3 m w H A 6 Flu G T I T R F 6 7 F n E a 2 w 8 u m 3 3 M \L E M A H M a 4 n 2 m 9 Q -l 3 a I I. 2 Wk F 9 I Q w m L 4 2 Z 6 Q w 7 5 2 2\ 3 6 m 2 7 2% G a 3 vs 6 4 6 w w W a 4 g wk 0 2 l a w s M w a 3 3 5 Amflflwnh4 w W W w 2 5 0 m //2 a 7 a z 64 x 5 III 3 3 3 4, 2 w 5 5 a 3 w w w G g y M M m 4 2 Z 5 3 3 J rvx Nov. 26, 1935. A. G. BELDEN El AL 2,022,178

HYDRAULICALLY OPERATEU AUTOMATIC CAM GRINDING MACHINE Filed April 16, 1932 18 Sheets-Sheet l8 Jwocntou ALBERT G. BELDEN MTA/E85E5 HERBERT AS/Ll EN Www a? 6&1? W

Patented Nov. 26, 1935 UNITED STATES PATENT OFFICE HYDRAULICALLY OPERATED AUTOMATIC CAM GRINDING MACHINE ohusetts Application April 16, 1932, Serial No. 605,707

22 Claim.

This invention relates to a grinding machine and more particularly to an automatic machine for grinding camshafts.

Heretofore various machines have been developed for grinding camshafts. These machines require many manually operable movements to control the various mechanisms in successively grinding a plurality of spaced cams on a camshaft. In the ordinary cam grinding apparatus,

it is necessary for the operator to manipulate a wheel feeding mechanism to feed the grinding wheel toward and from the work, to actuate a traversing mechanism to traverse the table and position the cams successively in operative relation with the grinding wheel, to rock the cam supporting bar to an inoperative position before traversing the work table and to rock it to an operative position after positioning another cam opposite to the grinding wheel, and to index the master cam roller manually to position it in operativerelation with the master cam corresponding with the product cam to be ground.

Numerous advances have been made in the art, such as providing automatic indexing mechanism for positioning the master cam roller, and automatically rocking the cam shaft supporting bar to and from an operative position in timed relation with the other movements of the machine. But, in all of these modified cam grinding machines, manual manipulations have still been necessary for starting the grinding operation and for controlling many of the operations required for grinding a set of cams.

The truing of the operative face of the grinding wheel in all of the previous machines is accomplished as an independent operation and as such is dependent wholly upon the human element. The operator dressed the wheel only when he though such truing was necessary. To do this, the operator manipulated the cross feed mechanism to feed the grinding wheel towards the truing tool and dress or true off the desired amount from the grinding wheel. In resuming grinding after the truing operation, it was necessary for the operator to employ the cut-and-try method until the finished product was properly sized.

The primary object of this invention is to provide a cam grinding machine which starts by manipulation of a single control and which completely grinds successive cams on a camshaft and then stops at the end of the cycle of operations.

It is a further object of this invention to provide an automatic hydraulically operated cam grinding machine with a main control valve which is mechanically actuated by a cycle or control cam arranged to control the entire cycle of operation.

It is a still further object of this invention to provide a wheel spindle reciprocating mechanism 5 for reciprocating the grinding wheel during the grinding operation which is hydraulically controlled by the main control valve so that the reciprocation of the grinding wheel is automatically stopped during the truing of the grinding wheel.

It is the specific object of this invention to provide such a machine in which the work supporting table is automatically and intermittently traversed or indexed to locate successive cams into operative relation with the grinding wheel to rough grind the cams while the camshaft is rotated at a relatively fast or rough grinding speed, then is automatically reciprocated to traverse a truing tool across the operative face of 20 the grinding wheel at a very slow speed, and finally is automatically and intermittently traversed or indexed in the opposite direction to locate successivecams into operative relation with the grinding wheel to finish grind the cams 25 while the camshaft is rotated at a relatively slow or finish grinding speed.

Other objects will be apparent from the following disclosure. One embodiment of this invention has been illustrated in the accompanying 30 drawings, in which like reference numerals indicate like parts:

Fig. 1 is a front elevation of the improved automatic cam grinding machine;

Fig. 2 is a rear elevation of the machine; 35

Fig. 3 is r. right-hand end view of the cam grinding machine on an enlarged scale, having the piston and cylinder for actuating the wheel spindle reciprocating mechanism broken away. and shown in sectionto more clearly illustrate 40 this feature;

Fig. 4 is a diagrammatic view, showing the fluid pressure system as well as a wiring diagram for the electrical control;

Fig. 5 is a similar diagrammatic view, showing 45 the fluid pressure system with the valves in position to reverse the table index valve;

Fig. 6 is a fragmentary front elevation on an enlarged scale of the main control lever and the dog mechanism for controlling the table traverse 50 or indexing movement, showing the main control lever in a neutral position;

Fig. '7 is a similar fragmentary view on an enlarged scale, showing the work table at the other end of its traversing stroke with the main 55 the table in a direction toward the left and also showing the wheel truing control dog;

Fig. 8-is a similar fragmentary view on an' enlarged scale, showing the truing dog in an operating position for reciprocating the work table to pass the diamond across the face of the wheel, showing the main control lever in full line and in extreme position to cause movement ofthe table toward the right and in a broken line position, showing its position for moving the table toward the left;

Fig. 9 is a similar fragmentary view on an enlarged scale, showing the main control lever in position after dog lever engages first dog and also showing the actuating solenoid;

Fig. 10 is a fragmentary sectional view through the control valves, showing the operating lever and main control lever in broken line;

Fig. 11 is a fragmentary sectional view. on an enlarged scale, taken approximately on the line H-ll of Fig. 2, showing the feed screw and the fluid pressure mechanism for automatically controlling the feeding movement of the grinding wheel, showing the piston, feed screw and wheel slide in the extreme rearward position;

Fig. 12 is a similar fragmentary sectional view on an enlarged scale through the hydraulic wheel feeding mechanism, showing the control valve shifted to a reverse position to cause an infeedenlarged scale, showing the wheel feeding mech-.

anism;

Fig. 14 is a fragmentary cross-sectional view, on an enlarged scale, showing the feeding mechanism in elevation and taken approximately on the line l|--l4 of Fig. 13;

Fig. 15 is a fragmentary rear view, on an enlarged scale, of the work sizing gauge block and its actuating mechanism for limiting the forward feeding movement of the grinding wheel for rough and finish grinding;

Fig. 16 is a fragmentarydetail view on an enlarged scale of the actuator for moving the wheel feed valve stop screws and the sizing gauge block;

Fig. 1'7 is a fragmentary cross-sectional view, on an enlarged scale, of the gauge plate, takenapproximately on the line l'l-l'l of Fig. 15;

Fig. 18 is a fragmentary view, on an enlarged scale, of the driving mechanism for the headstock spindle, showing the clutch actuating mechanism for changing the work rotation from a roughing to a finishing grinding speed;

Fig. 19 is a fragmentary view of the parts 'shown in Fig. 18, taken approximately on the line l9-l3 of Fi 18;

Fig. 20 is a fragmentary plane view, showing the driving mechanism for the master control cam and the main control valve mechanism;

Fig. 21 is a fragmentary view, on an enlarged scale, of the main control cam and its actuated lever, taken approximately on the line 2l-2l of Fig. 20;

Fig. 22 is a detail view of the main control cam,

showing more fully the table positioning lever which is partially indicated in Fig. 23;

Fig. 25 is a fragmentary view, taken approximately on the line 25-23 of Fig. 21, showing the master cam partially in section and the master 5 control cam follower;

Fig. 26 is a fragmentary view,'o'n an enlarged scale, of the indexing mechanism for .automatically indexing the master cam roller;

Fig. 27 is a fragmentary view of the master 10 cam roller indexing mechanism shown in Fig. 26, taken from the right-hand end;

Fig. 28 is a fragmentary plan view of the table positioning lever, taken approximately on the line 23-28 of. Fig. .24; 15

Fig. 29 is a fragmentary cross-sectional view through the machine, taken approximately on the line 23-23 of Fig. 6, showing the fluid pressure cylinder for actuating the table positioning lever; I 20 Fig. 30 is a fragmentary cross-sectional view through the rock bar, showing the friction drive for eliminating lost motion between the master cam and the product camshaft;

.Fig. 31 is a fragmentary cross-sectional view, 2:, taken approximately on the line 3l- 3l of Fig. '7, showing the main control cam and valve in elevation, together with the valve actuating levers;

Fig. 32 is a similar cross-sectional view, taken 30 approximately on the line 3232 of Fig. 6, showing the pilot valve actuating mechanism;

Fig. 33' is a longitudinal sectional view through the valve mechanism, showing the operating lever similar to Fig. 10, but showing the main con- 3:, trol lever in a central position;

Fig. 34 is a fragmentary cross-sectional view through the main control valve, showing the main control cam, similar to the view shown in Fig. 23, but with the main control valve in a rearward position, admitting fluid to the feed cylinder to cause an infeeding movement of th grinding wheel; a

Fig. 35 is a similar fragmentary cross-sectional view, but withthe main control cam and valve positioned as the cam approaches the end of the cycle on a product cam;

Fig. 36 is a fragmentary horizontal sectional view, taken approximately on the line 36-36 of Fig. 33, showing the main control valve in its forward position;

Fig. 37 is a fragmentary horizontal sectional view through the pilot valve, taken approximately on the line 3l3'| of Fig. 33;

Fig. 38 is a fragmentary horizontal sectional View through the reversing valve and low speed valve, taken approximately on the line 38-38 of Fig. 32;

Fig. 39 is a similar fragmentary sectional view, taken approximately on the line 3939 of Fig. 35;

Fig. 40 is a fragmentary cross-sectional view, taken approximately on the line 48-40 of Fig. 31, showing the low speed valve for producing a slow speed during truing of the grinding wheel;

Fig..41 is a fragmentary sectional view, taken approximately on the line 4I4l, through the slow speed valve of Fig. 40;

Fig. 42 is a sectional view similar to Fig. 40, on a reduced scale, showing the slow speed valve at the opposite end of its stroke;

Fig. 43 is a sectional view, taken approximately on the line 33-43 of Fig. 11, through the feed control valve;

Fig. 44 is a fragmentary detail view showing the 

